Tension test fixture

Abstract

The utility model provides a tension test fixture, which is used for performing tension test on a welding spot between a battery module and a tab, and comprises a fixture body and a pressing plate, and the fixture body is provided with a positioning groove for accommodating the battery module; the pressing plate is arranged on the jig body, the pressing plate can limit the battery module located in the positioning groove to be separated from the positioning groove, and the pressing plate covers part of the notch of the positioning groove, so that the tab can extend out of the positioning groove through the notch, not covered by the pressing plate, of the positioning groove. In the tension test process, tension is applied to the tabs, and meanwhile, the battery module is pressed in the positioning groove by the pressing plate, so that the position stability of the battery module can be ensured, and the accuracy and credibility of a test result are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and more particularly relates to a tensile test fixture. BACKGROUND

[0002] In the production process of a battery module, a tab is welded on an input or output electrode thereof. In order to ensure the welding strength between the tab and the battery module, a tensile test needs to be performed on the connecting welding spot. At present, the tensile test of the battery module is usually performed manually by an operator who places the battery module into a tensile test device, applies a tensile force to the tab by using the tensile test device, and evaluates the welding quality by observing the fracture of the welding spot under different tensile forces.

[0003] However, manual operation cannot guarantee the stable position of the battery module during the test process, so that the size, direction or speed of the tensile force applied to the tab by the tensile test device is difficult to keep consistent, thereby causing a large error in the test result and affecting the accurate evaluation of the welding spot quality. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the embodiment of the application is to provide a tensile test fixture to solve the problem that it is difficult to keep the position of the battery module stable in the prior art.

[0005] To achieve the above purpose, the application provides a tensile test fixture for performing a tensile test on a welding spot between a battery module and a tab, the tensile test fixture comprising:

[0006] a fixture body provided with a positioning groove for accommodating the battery module;

[0007] a pressing plate arranged on the fixture body, the pressing plate being capable of limiting the battery module positioned in the positioning groove from escaping from the positioning groove, and the pressing plate covering part of the groove opening of the positioning groove so that the tab can extend out of the positioning groove through the groove opening of the positioning groove which is not covered by the pressing plate.

[0008] In some embodiments, the number of the positioning grooves is multiple, and the pressing plate can cover part of the groove opening of at least one of the positioning grooves.

[0009] In some embodiments, the fixture body has a first mounting surface, the multiple positioning grooves include a first positioning groove arranged on the first mounting surface, the pressing plate is arranged on the first mounting surface and covers part of the groove opening of the first positioning groove, and the tensile test fixture further comprises a supporting plate slidably arranged in the first positioning groove along the groove depth direction of the first positioning groove, and the supporting plate can jointly clamp the battery module with the pressing plate.

[0010] In some embodiments, the tensile test fixture further comprises a first fastener comprising a first screw portion and a first nut portion; an outer wall surface of the fixture body is provided with a first sliding slot in communication with the first positioning slot, the first sliding slot extending along a slot depth direction of the first positioning slot, the first screw portion penetrating through the first sliding slot and being threadedly connected to the support plate, and the first nut portion being connected to the first screw portion and capable of abutting against the outer wall surface of the fixture body.

[0011] In some embodiments, the fixture body further has a second mounting surface, the first mounting surface being protruded from the second mounting surface, and the plurality of positioning slots further comprise a second positioning slot provided on the second mounting surface, the second positioning slot being used for accommodating part of the battery modules; the pressing plate is parallel to and spaced apart from the second mounting surface to limit the battery modules in the second positioning slot from escaping out of the second positioning slot.

[0012] In some embodiments, the pressing plate is provided with a relief hole opposite to the second positioning slot in a slot depth direction of the second positioning slot to avoid the tab on the battery module in the second positioning slot.

[0013] In some embodiments, the plurality of positioning slots further comprise a third positioning slot provided on the first mounting surface, the third positioning slot being arranged in a spaced-apart manner with the first positioning slot, and the pressing plate being capable of covering part of a slot opening of the third positioning slot.

[0014] In some embodiments, the pressing plate is slidingly provided on the fixture body, and a sliding direction of the pressing plate is perpendicular to a slot depth direction of the positioning slot.

[0015] In some embodiments, the tensile test fixture further comprises a second fastener comprising a second screw portion and a second nut portion, the pressing plate is provided with a second sliding slot, an extension direction of the second sliding slot being perpendicular to the slot depth direction of the positioning slot, the second screw portion penetrating through the second sliding slot and being threadedly connected to the fixture body, and the second nut portion being connected to the second screw portion and capable of abutting against an end surface of the pressing plate facing away from the fixture body.

[0016] In some embodiments, the tensile test fixture further comprises a base, the fixture body being connected to the base, and the base being used for being mounted on a workbench of a tensile test device.

[0017] The advantages of the tensile testing fixture provided in this application are as follows: Compared with the prior art, when performing tensile testing on the connection weld between the battery module and the electrode tab, a pressure plate is used to firmly fix the battery module in the positioning groove, while the electrode tab can extend from the opening of the positioning groove not covered by the pressure plate, so that tensile force can be applied to the electrode tab. During the test, the battery module is fixed in the fixture body, which ensures that the tensile force applied to the electrode tab is consistent in magnitude, direction, and speed, thereby improving the accuracy and reliability of the test results. In addition, using the tensile testing fixture can also improve the efficiency of tensile testing of battery modules and reduce the labor intensity of testing personnel. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the tensile testing fixture in the embodiments of this application;

[0020] Figure 2 This is an exploded view of the tensile testing fixture in the embodiments of this application;

[0021] Figure 3 This is a schematic diagram of the aluminum-cased battery structure in an embodiment of this application;

[0022] Figure 4 This is a schematic diagram of the aluminum-cased battery installed in the first positioning groove in an embodiment of this application;

[0023] Figure 5 for Figure 4 Side view in direction A;

[0024] Figure 6 This is a schematic diagram of the cylindrical battery structure in an embodiment of this application;

[0025] Figure 7 This is a schematic diagram of the cylindrical battery installed in the second positioning groove in an embodiment of this application;

[0026] Figure 8 This is a schematic diagram of the circuit board structure in an embodiment of this application;

[0027] Figure 9 This is a schematic diagram of the circuit board being installed in the third positioning groove in an embodiment of this application.

[0028] The following are the labeling elements in the figure:

[0029] 10-aluminum shell battery; 11-first tab; 20-cylindrical battery; 21-second tab; 30-circuit board; 31-third tab; 100-jig body; 100a-first mounting surface; 100b-second mounting surface; 101-first positioning groove; 102-second positioning groove; 103-third positioning groove; 104-first sliding groove; 200-pressing plate; 201-avoidance hole; 202-second sliding groove; 300-support plate; 400-first fastener; 500-second fastener; 600-base. DETAILED DESCRIPTION

[0030] In order to make the technical problems to be solved, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0032] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0033] In addition, the terms "first", "second", "third", etc. are only used for description purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0034] The embodiment of the present application provides a tension test jig for testing the welding point between the battery module and the tab. As shown in FIG. 1, the tension test jig comprises a jig body 100, a pressing plate 200, a support plate 300, a first fastener 400, and a second fastener 500. Figure 1 and Figure 2As shown, the tensile test fixture includes a fixture body 100 and a pressing plate 200, the fixture body 100 is provided with a positioning groove for accommodating the battery module; the pressing plate 200 is arranged on the fixture body 100, the pressing plate 200 can limit the battery module located in the positioning groove from escaping the positioning groove, and the pressing plate 200 covers part of the slot of the positioning groove, so that the tab can extend out of the positioning groove through the slot of the positioning groove which is not covered by the pressing plate 200.

[0035] Specifically, the fixture body 100 can be a rectangular or other geometric block structure, and the fixture body 100 can be made of metal or non-metal materials. The positioning groove is a cavity structure arranged on the fixture body 100 and has a certain accommodation volume. The shape of the positioning groove can match the shape of the battery module, so that the battery module can be stably placed in the positioning groove. The positioning groove has at least one slot, and the size of the slot is designed according to the size of the battery module to ensure that the battery module is easily put in or taken out. In addition, the slot of the positioning groove can be located at any end of the fixture body 100, for example, the slot of the positioning groove is arranged at the top end of the fixture body 100, so that the battery module can be put into the positioning groove from top to bottom.

[0036] The pressing plate 200 can be a rectangular or other geometric flat plate, and the pressing plate 200 can also be made of metal or non-metal materials. The pressing plate 200 can be arranged at one end of the fixture body 100 where the positioning groove is arranged, for example, the pressing plate 200 is installed at the top end of the fixture body 100. The size of the pressing plate 200 can be designed according to the size and shape of the slot of the positioning groove, so that the pressing plate 200 can cover part of the slot of the positioning groove.

[0037] When performing the tensile test of the welding point between the battery module and the tab, the battery module is placed in the positioning groove, and the pressing plate 200 is used to press the end face of the battery module, so as to ensure the stable position of the battery module in the positioning groove. At the same time, the tab extends out of the positioning groove through part of the slot which is not covered by the pressing plate 200, so as to facilitate the tensile test equipment to apply tension to the tab. During the test, the battery module is pressed in the positioning groove by the pressing plate 200, so that the position of the battery module is stable during the test, and the battery module is prevented from escaping the positioning groove when subjected to tension. Compared with manual testing by the tester, the test efficiency and test accuracy can be improved, the error caused by manual operation can be reduced, and the reliability and consistency of the test results can be ensured.

[0038] It can be understood that the depth of the positioning groove can be the same as the length of the battery module in the vertical direction, and when the battery module is embedded in the positioning groove, the top end of the battery module is flush with the top surface of the jig body 100, and at this time the pressing plate 200 can press the top end surface of the battery module. The depth of the positioning groove can also be less than the vertical dimension of the battery module, and after the battery module is placed in the positioning groove, the top end of the battery module protrudes from the top surface of the jig body 100, so that the pressing plate 200 can press the top end surface of the battery module. In addition, the depth of the positioning groove can also be greater than the vertical dimension of the battery module, and the pressing plate 200 is provided with a protruding structure that can be embedded in the slot of the positioning groove, and after the battery module is placed in the positioning groove, the protruding structure on the surface of the pressing plate 200 is embedded in the slot of the positioning groove and is pressed on the top end of the battery module.

[0039] In some embodiments, the number of positioning grooves is multiple, and the pressing plate 200 can cover part of the slot of at least one of the positioning grooves. Among them, the slots of the multiple positioning grooves can be collectively arranged on the same end surface of the jig body 100, and the pressing plate 200 can be movably connected to the jig body 100, so that by changing the mounting position of the pressing plate 200 on the jig body 100, the pressing plate 200 can be covered on part of the slot of any one or more positioning grooves.

[0040] Each positioning groove can individually place a battery module, and the shape and size of each positioning groove can be the same to accommodate multiple battery modules of the same type in the jig body 100, so that multiple battery modules of the same type can be tested at the same time; The shape and size of each positioning groove can also be different, and the positioning grooves at different positions are suitable for different types of battery modules, and the corresponding positioning grooves are placed in the test according to the type of the battery module.

[0041] As shown in Figure 2 In some embodiments, the jig body 100 has a first mounting surface 100a, and the multiple positioning grooves include a first positioning groove 101 arranged on the first mounting surface 100a, and the pressing plate 200 is arranged on the first mounting surface 100a and covers part of the slot of the first positioning groove 101. The tensile test jig further comprises a supporting plate 300 slidably arranged in the first positioning groove 101 along the slot depth of the first positioning groove 101, and the supporting plate 300 can jointly clamp the battery module with the pressing plate 200.

[0042] Specifically, the first mounting surface 100a can be the top end surface of the jig body 100, i.e., the first positioning groove 101 and the pressing plate 200 are both arranged on the top end surface of the jig body 100, so that the pressing plate 200 can cover part of the slot of the first positioning groove 101. The support plate 300 is a flat plate structure matching the shape of the first positioning groove 101, and the support plate 300 is embedded in the first positioning groove 101. The extension direction of the first positioning groove 101 refers to the depth direction, i.e., the support plate 300 can slide in the vertical direction in the first positioning groove 101.

[0043] As shown in Figure 3 , the battery module can be an aluminum shell battery 10, which has a rectangular structure, and a first tab 11 is welded at the top end surface of the aluminum shell battery 10. The aluminum shell battery 10 is designed to be of different sizes according to its storage capacity. The shape of the first positioning groove 101 is a rectangle matching the shape of the aluminum shell battery 10, and the depth of the first positioning groove 101 can be designed based on the aluminum shell battery 10 with the largest vertical size, so that when the support plate 300 slides to the bottom of the first positioning groove 101, the aluminum shell battery 10 with the largest vertical size can be completely placed in the first positioning groove 101.

[0044] As shown in Figure 4 and Figure 5 , when the aluminum shell battery 10 and the first tab 11 are subjected to a tensile test, the aluminum shell battery 10 is placed in the first positioning groove 101, the first tab 11 extends out through the slot of the first positioning groove 101 which is not covered by the pressing plate 200, the bottom of the aluminum shell battery 10 abuts against the upper surface of the support plate 300, and the height of the support plate 300 is adjusted according to the size of the aluminum shell battery 10, so that the top surface of the aluminum shell battery 10 is flush with the top surface of the jig body 100, ensuring that the pressing plate 200 can be accurately pressed on the top of the aluminum shell battery 10, thereby being applicable to the tensile test of aluminum shell batteries 10 of different sizes.

[0045] In addition, the first positioning groove 101 can also be provided with a slot at the horizontal end surface of one side of the jig body 100, so that the aluminum shell battery 10 can slide into the first positioning groove 101 in the horizontal direction. The design of the horizontal slot can realize the quick positioning and fixing of the aluminum shell battery 10 without changing the position of the pressing plate 200, facilitating the quick installation and removal of the aluminum shell battery 10 and improving the test efficiency.

[0046] In some embodiments, the tensile test jig further comprises a first fastener 400, the first fastener 400 comprising a first screw rod portion and a first nut portion, the jig body 100 is provided with a first sliding groove 104 communicating with the first positioning groove 101, the extension direction of the first sliding groove 104 is parallel to the extension direction of the first positioning groove 101, the first screw rod portion passes through the first sliding groove 104 and is threadedly connected to the support plate 300, and the first nut portion abuts against the outer wall surface of the jig body 100.

[0047] Specifically, the first fastener 400 can be a fastening bolt, the outer surface of the first screw rod part has threads, and the shape of the first nut part can be a regular hexagon, facilitating the driving of the first nut part to rotate by using a wrench or the like. The first driving part can also be arranged on the side of the first nut part, facilitating the manual rotation of the first fastener 400 by the tester through the first driving part.

[0048] The first sliding groove 104 is a long and narrow slot hole arranged through the jig body 100 to communicate with the first positioning groove 101. When the first positioning groove 101 is vertically arranged, the first sliding groove 104 is also vertically arranged. The width of the first sliding groove 104 is adapted to the diameter of the first screw rod part, so that the first screw rod part can pass through the first sliding groove 104.

[0049] The position of the supporting plate 300 exposed to the first sliding groove 104 is provided with a first threaded hole. After the first screw rod part passes through the first sliding groove 104, it is screwed into the first threaded hole, and the first nut part is pressed against the outer wall surface of the jig body 100. By using the friction force between the first nut part and the jig body 100, the position of the supporting plate 300 in the first positioning groove 101 is stabilized, and stable support is provided for the aluminum shell battery 10, so that displacement is not easily generated during the test.

[0050] Among them, the number of the first fastener 400 and the first sliding groove 104 can be set to be multiple, for example, two first sliding grooves 104 are arranged on the jig body 100 and are arranged in the width direction of the jig body 100. The position corresponding to each first sliding groove 104 of the supporting plate 300 is provided with a first threaded hole, and two first fasteners 400 are used to pass through two first sliding grooves 104 respectively and connect with the supporting plate 300, so as to stabilize the supporting plate 300 by using the two first fasteners 400, so that the force on both sides of the supporting plate 300 is uniform, and the stability of the position of the supporting plate 300 is further improved.

[0051] In some embodiments, the jig body 100 also has a second mounting surface 100b, and the first mounting surface 100a protrudes from the second mounting surface 100b. The plurality of positioning grooves also includes a second positioning groove 102 arranged on the second mounting surface 100b, and the second positioning groove 102 is used to accommodate part of the battery module; and the pressing plate 200 is parallel to and spaced apart from the second mounting surface 100b, so as to be capable of being pressed against the end surface of the battery module protruding from the second positioning groove 102.

[0052] Specifically, the second mounting surface 100b can also be located at the top of the jig body 100. For example, a notch can be arranged at the side end corner of the jig body 100 to form the first mounting surface 100a and the second mounting surface 100b which are spaced apart at the top of the jig body 100. The height of the first mounting surface 100a is higher than that of the second mounting surface 100b.

[0053] The second positioning groove 102 is arranged on the second mounting surface 100b and forms a slot on the second mounting surface 100b. The pressing plate 200 is arranged on the first mounting surface 100a and extends to the upper side of the second mounting surface 100b, so as to cover part of the slot of the second positioning groove 102. The pressing plate 200 and the slot of the second positioning groove 102 are spaced apart in the vertical direction.

[0054] As shown in Figure 6 and Figure 7 , the battery module can be a cylindrical battery 20, and a second tab 21 is welded to the end face of the cylindrical battery 20. The second positioning groove 102 is a circular groove, and the inner diameter of the second positioning groove 102 is slightly larger than the diameter of the cylindrical battery 20, so that the cylindrical battery 20 can be placed in the circular groove. The depth of the second positioning groove 102 is less than the axial length of the cylindrical battery 20. After the cylindrical battery 20 is placed in the second positioning groove 102, the upper side of the cylindrical battery 20 protrudes from the second positioning groove 102, so as to facilitate the placement and removal of the cylindrical battery 20. The distance between the bottom surface of the second positioning groove 102 and the lower surface of the pressing plate 200 is adapted to the axial length of the cylindrical battery 20, so that the pressing plate 200 can be pressed on part of the end face of the cylindrical battery 20.

[0055] In some embodiments, the pressing plate 200 is provided with a relief hole 201 corresponding to part of the slot of the second positioning groove 102. The relief hole 201 is a groove structure arranged on the pressing plate 200. The relief hole 201 can be arranged on the part of the pressing plate 200 on the upper side of the second positioning groove 102, and the size of the relief hole 201 is matched with the size of the second tab 21. When the pressing plate 200 is pressed on the top end face of the cylindrical battery 20, the second tab 21 can extend upward to the upper side of the pressing plate 200 through the relief hole 201, so as to facilitate the application of tension to the tab.

[0056] In some embodiments, the plurality of positioning grooves further includes a third positioning groove 103 arranged on the first mounting surface 100a, and the third positioning groove 103 is arranged in a spaced manner with the first positioning groove 101. The pressing plate 200 can cover part of the slot of the third positioning groove 103.

[0057] Specifically, as shown in Figure 8 and Figure 9 , the battery module can be a circuit board 30 for controlling the battery. The circuit board 30 has a rectangular structure, and a third tab 31 is welded to one end of the circuit board 30. The third positioning groove 103 is a long and narrow groove with the same shape as the circuit board 30. The depth of the third positioning groove 103 is matched with the overall thickness of the circuit board 30, so that the circuit board 30 can be completely embedded in the third positioning groove 103. The extending direction of the slot of the third positioning groove 103 can be parallel to the extending direction of the slot of the first positioning groove 101, and the first positioning groove 101 and the third positioning groove 103 are arranged in a spaced manner along the width direction of the first mounting surface 100a.

[0058] When the solder joint between the circuit board 30 and the third tab 31 is subjected to the tensile test, the circuit board 30 is placed in the third positioning slot 103, and the pressing plate 200 is pressed on the end surface of the circuit board 30, and the third tab 31 extends through the part of the slot of the third positioning slot 103 not covered by the pressing plate 200, so as to facilitate the application of tensile force to the third tab 31.

[0059] In addition, the end surface of the third positioning slot 103 on the horizontal side of the jig body 100 can also be provided with an opening, so that the circuit board 30 can be inserted horizontally into the third positioning slot 103 in the horizontal direction, and the horizontal insertion and removal of the circuit board 30 can be facilitated without changing the position of the pressing plate 200, thereby improving the test efficiency.

[0060] It can be understood that the number of the first positioning slot 101, the second positioning slot 102 and the third positioning slot 103 provided on the jig body 100 is not limited to one, and any number of the first positioning slot 101, the second positioning slot 102 or the third positioning slot 103 can be provided according to actual needs. In addition, the types of positioning slots on the jig body 100 can also be arbitrarily set according to actual needs. For example, only the first positioning slot 101, the second positioning slot 102 or the third positioning slot 103 is provided on the jig body 100, or any two of the first positioning slot 101, the second positioning slot 102 and the third positioning slot 103 are provided on the jig body 100.

[0061] In some embodiments, the pressing plate 200 is slidingly provided on the jig body 100, and the sliding direction of the pressing plate 200 is perpendicular to the extension direction of the positioning slot.

[0062] Specifically, the extension direction of the positioning slot refers to the depth direction thereof. For example, the extension direction of the positioning slot is the vertical direction, and the pressing plate 200 is slidingly provided on the jig body 100 in the horizontal direction. By sliding the pressing plate 200, the relative position of the pressing plate 200 and the first positioning slot 101, the second positioning slot 102 or the third positioning slot 103 can be adjusted to adapt to the test position of different battery modules, and the openings of the positioning slots can be exposed by moving the pressing plate 200, thereby facilitating the insertion and removal of the battery module.

[0063] When the first positioning slot 101 is used to test the aluminum shell battery 10 or the third positioning slot 103 is used to test the solder joint tensile strength of the circuit board 30, the pressing plate 200 can be moved to the opening of the first positioning slot 101 or the opening of the third positioning slot 103. When the second positioning slot 102 is used to test the solder joint of the cylindrical battery 20, the pressing plate 200 is slid to above the second mounting surface 100b 100b, so that the pressing plate 200 can be pressed on the top of the cylindrical battery 20, and the avoiding hole 201 corresponds to the position of the second tab 21 of the cylindrical battery 20.

[0064] In some embodiments, the tensile testing fixture further comprises a second fastener 500, the second fastener 500 comprising a second screw portion and a second nut portion, the pressing plate 200 is provided with a second sliding groove 202, the extension direction of the second sliding groove 202 is perpendicular to the extension direction of the positioning groove, the second screw portion passes through the second sliding groove 202 and is threadedly connected to the fixture body 100, and the second nut portion abuts against the end surface of the pressing plate 200 away from the fixture body 100.

[0065] As shown in Figure 2 the second fastener 500 can also be a fastening bolt, the outer surface of the second screw portion is provided with threads, and the shape of the second nut portion can be a regular hexagon, so as to facilitate the rotation of the second nut portion by using a wrench or the like. The periphery of the second nut portion can also be provided with a second driving portion, so as to facilitate the manual rotation of the second fastener 500 by the tester through the second driving portion.

[0066] The second sliding groove 202 is a long strip-shaped through groove provided on the pressing plate 200, and the first mounting surface 100a of the fixture body 100 is exposed at the position of the second sliding groove 202. At least one threaded hole is provided at the position, and the second screw portion is screwed into the threaded hole of the fixture body 100 through the second sliding groove 202. When the second nut portion is tightened, the second nut portion will press the pressing plate 200 against the first mounting surface 100a of the fixture body 100, so as to ensure the stability of the position of the pressing plate 200 during the test. When the second nut portion is loosened, the pressing plate 200 can slide freely along the extension direction of the second sliding groove 202, so as to be able to adjust the position of the pressing plate 200 and adapt to different test requirements.

[0067] In addition, the pressing plate 200 can also be slidably connected to the top end of the fixture body 100 through a guide rail structure, a pulley structure or the like, which is not limited in the present embodiment.

[0068] In some embodiments, the tensile testing fixture further comprises a base 600, the fixture body 100 is connected to the base 600, and the base 600 is used for mounting on the workbench of the tensile testing device.

[0069] Specifically, the base 600 can be adaptively provided according to the connectable structure of the workbench of the tensile testing device. For example, when the workbench of the tensile testing device has a T-shaped groove, the base 600 can be provided in a strip-shaped structure with a T-shaped cross section, so as to be able to be embedded into the T-shaped groove of the workbench, and the tensile testing fixture can be more conveniently mounted on the workbench of the tensile testing device. Of course, the base 600 can also be provided in other shapes according to different connection modes of the workbench in the tensile testing device.

[0070] In conclusion, the tension test fixture provided by the embodiments of the present application can ensure the position stability of the battery module during the test by the positioning groove arranged on the fixture body 100 and the pressing plate 200 covering the partial slot, so that the tension size, direction or speed borne by the tab can be kept consistent, thereby reducing the error generated by manual measurement, improving the accuracy of the tension test, and ensuring the reliability of the test result.

[0071] The above merely provides the preferred embodiments of the present application but not for limiting the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A tensile testing fixture for performing tensile testing on the solder joints between a battery module and a tab, characterized in that, The tensile test fixture comprises: a fixture body provided with positioning slots for accommodating the battery modules; a pressing plate arranged on the fixture body, the pressing plate being capable of limiting the battery modules positioned in the positioning slots from escaping from the positioning slots, the pressing plate covering part of the slot opening of the positioning slots so that the tab can extend out of the positioning slots through the slot opening of the positioning slots not covered by the pressing plate.

2. The pull test fixture of claim 1, wherein, The number of the positioning slots is multiple, and the pressing plate can cover part of the slot opening of at least one of the positioning slots.

3. The pull test fixture of claim 2, wherein, The fixture body has a first mounting surface, the multiple positioning slots include a first positioning slot arranged on the first mounting surface, the pressing plate is arranged on the first mounting surface and covers part of the slot opening of the first positioning slot, and the tensile test fixture further comprises a supporting plate slidably arranged in the first positioning slot along the slot depth direction of the first positioning slot, and the supporting plate can jointly clamp the battery module with the pressing plate.

4. The pull test fixture of claim 3, wherein, The tensile test fixture further comprises a first fastener, the first fastener comprising a first screw rod portion and a first nut portion; an outer wall surface of the fixture body is provided with a first sliding groove in communication with the first positioning slot, the first sliding groove extending along the slot depth direction of the first positioning slot, the first screw rod portion penetrating through the first sliding groove and being threadedly connected to the supporting plate, and the first nut portion being connected to the first screw rod portion and capable of abutting against the outer wall surface of the fixture body.

5. The pull test fixture of claim 3, wherein, The fixture body further has a second mounting surface, the first mounting surface protruding from the second mounting surface, and the multiple positioning slots further include a second positioning slot provided on the second mounting surface, the second positioning slot being used for accommodating part of the battery modules; the pressing plate is parallel to and spaced apart from the second mounting surface to limit the battery modules in the second positioning slot from escaping from the second positioning slot.

6. The pull test fixture of claim 5, wherein, The pressing plate is provided with a relief hole opposite to the second positioning slot in the slot depth direction of the second positioning slot to avoid the tab on the battery module in the second positioning slot.

7. The pull test fixture of claim 3, wherein, The multiple positioning slots further include a third positioning slot arranged on the first mounting surface, the third positioning slot being arranged in space with the first positioning slot, and the pressing plate being capable of covering part of the slot opening of the third positioning slot.

8. The pull testing fixture of any one of claims 1-7, wherein, The pressing plate is slidably arranged on the fixture body, and the sliding direction of the pressing plate is perpendicular to the slot depth direction of the positioning slots.

9. The pull test fixture of claim 8, wherein, The tensile test fixture further comprises a second fastener, the second fastener comprising a second screw rod portion and a second nut portion, the pressing plate being provided with a second sliding groove, the extension direction of the second sliding groove being perpendicular to the slot depth direction of the positioning slots, the second screw rod portion penetrating through the second sliding groove and being threadedly connected to the fixture body, and the second nut portion being connected to the second screw rod portion and capable of abutting against the end surface of the pressing plate away from the fixture body.

10. The pull testing fixture of any one of claims 1-7, wherein, The tensile test fixture further comprises a base, the fixture body being connected to the base, and the base being used for being mounted on the workbench of the tensile test equipment.

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